CN111299511B - Preparation method of single crystal high-temperature alloy thin-wall casting - Google Patents
Preparation method of single crystal high-temperature alloy thin-wall casting Download PDFInfo
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- CN111299511B CN111299511B CN202010258519.5A CN202010258519A CN111299511B CN 111299511 B CN111299511 B CN 111299511B CN 202010258519 A CN202010258519 A CN 202010258519A CN 111299511 B CN111299511 B CN 111299511B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B11/00—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/52—Alloys
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Abstract
The invention provides a preparation method of a single crystal high-temperature alloy thin-wall casting, belonging to the technical field of high-temperature alloys. According to the invention, the wax paper A is attached to the surface of the ceramic support body, so that the shape of the thin-wall wax mould can be kept stable and not deformed in the processes of slurry coating and casting, and the problem that the wax mould is easy to deform is solved; when thin-wall castings with different wall thicknesses or shapes need to be prepared, the wax paper A with different thicknesses only needs to be selected for cutting, and the thickness and the shape of the thin wall can be conveniently adjusted. The results of the embodiment show that the method can be used for preparing the thin-wall casting with the thickness of 0.3-1 mm, the dendrite sizes on two sides of the casting are close, the structure is uniform, the problems of bending deformation, under-casting and the like are avoided, and the wax mold manufacturing yield and the casting yield are improved.
Description
Technical Field
The invention relates to the technical field of high-temperature alloys, in particular to a preparation method of a single-crystal high-temperature alloy thin-wall casting.
Background
With the continuous increase of the requirements on the thrust and power of an aeroengine, higher requirements are put on the single crystal high-temperature alloy air-cooled turbine blade. And the thinner the blade, the more the cooling efficiency can be improved. Typically, the minimum wall thickness of such single crystal superalloy blades is less than 0.5mm, and the resulting thin wall effect is of greater concern.
For the research of the thin-wall effect of the single crystal superalloy blade, a thin-wall sample close to the state of the single crystal superalloy blade needs to be prepared as a basis. In the prior stage, the thin-wall sample is mainly prepared by casting the thin-wall sample by pressing and injecting a wax mold in a mold, for example, Chinese patent CN201610245308.1 discloses a preparation method of a precision investment casting single crystal high-temperature alloy thin-wall sample, although the surface state of the obtained sample is consistent with the surface state of the thin-wall position of an actual air-cooled turbine blade, the wax mold is easy to deform in the preparation process, and the size of a casting highly depends on the mold, so that the thickness and the shape of the thin-wall casting are not convenient to adjust according to the requirements.
Disclosure of Invention
The invention aims to provide a preparation method of a single crystal high-temperature alloy thin-wall casting.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a single crystal high temperature alloy thin-wall casting, which comprises the following steps:
attaching the wax paper A to the surface of a ceramic support body, and forming a wax pattern on the surface of the ceramic support body to obtain a support wax pattern combination; the bottom edge of the wax paper A is superposed with the bottom edge of the ceramic support body, and the shape and the size of the wax paper A are the same as those of a target single crystal superalloy thin-wall casting;
fixing a crystal selector and amplifier combination at the bottom of the supporting wax pattern combination to obtain an intermediate; the amplifier in the crystal selector and amplifier combination is connected with the bottom of the supporting wax pattern combination; the material of the crystal selector and amplifier combination is wax material;
assembling the intermediate body on a pouring gate disc, then carrying out slurry dipping and shell coating on the intermediate body to form a shell, and dewaxing to obtain a casting mold;
and casting the single-crystal high-temperature alloy melt into the casting mould to obtain the single-crystal high-temperature alloy thin-wall casting.
Preferably, the mass content of the alumina in the ceramic support body is more than 99%, and the thickness of the ceramic support body is 0.5-1 mm.
Preferably, when the shell is coated by the slurry, the wax mould is divided, one side of the wax mould is provided with the ceramic support body and the shell, the other side of the wax mould is provided with the shell, and the sum of the thicknesses of the ceramic support body and the shell on one side of the wax mould is equal to the thickness of the shell on the other side of the wax mould.
Preferably, the thickness of the shell on the side of the wax mould without the ceramic support body is 5-15 mm.
Preferably, the ceramic support body further comprises a wax paper B which is attached to the top of the ceramic support body on the same side as the wax paper A, the wax paper B is in an inverted trapezoid shape, and the short bottom edge of the wax paper B is overlapped with the top edge of the wax paper A.
Preferably, the height of the wax paper B is 10-15 mm, and the long bottom edge is 1.25-2 times of the short bottom edge.
Preferably, the longitudinal dimension of the ceramic support body is the sum of the longitudinal dimension of the target single crystal superalloy thin-wall casting and the height of the wax paper B, and the transverse dimension of the ceramic support body is 1-5 mm larger than the transverse dimension of the target single crystal superalloy thin-wall casting.
Preferably, the dewaxing is steam dewaxing, and the dewaxing temperature is 120-150 ℃ and the dewaxing time is 20-60 min.
Preferably, the casting temperature is 1520-1560 ℃, and the drawing speed is 1-5 mm/min.
Preferably, the wall thickness of the single crystal high-temperature alloy thin-wall casting is 0.3-1 mm.
The invention provides a preparation method of a single crystal high temperature alloy thin-wall casting, which comprises the following steps: attaching the wax paper A to the surface of a ceramic support body, and forming a wax pattern on the surface of the ceramic support body to obtain a support wax pattern combination; the bottom edge of the wax paper A is superposed with the bottom edge of the ceramic support body, and the shape and the size of the wax paper A are the same as those of a target single crystal superalloy thin-wall casting; fixing a crystal selector and amplifier combination at the bottom of the supporting wax pattern combination to obtain an intermediate; the amplifier in the crystal selector and amplifier combination is connected with the bottom of the supporting wax pattern combination; the material of the crystal selector and amplifier combination is wax material; assembling the intermediate body on a pouring gate disc, then carrying out slurry dipping and shell coating on the intermediate body to form a shell, and dewaxing to obtain a casting mold; and casting the single-crystal high-temperature alloy melt into the casting mould to obtain the single-crystal high-temperature alloy thin-wall casting.
According to the invention, the wax paper A is attached to the surface of the ceramic support body, so that the shape of the thin-wall wax mould can be kept stable and not deformed in the processes of slurry coating and casting, and the problem that the wax mould is easy to deform is solved; when thin-wall castings with different wall thicknesses or shapes need to be prepared, the wax paper A with different thicknesses only needs to be selected for cutting, and the thickness and the shape of the thin wall can be conveniently adjusted.
Furthermore, the content of alumina in the ceramic support body is controlled to be more than 99 percent, and the thickness of the ceramic support body is controlled to be 0.5-1 mm, so that the ceramic support body has high thermal conductivity, and the temperature gradients of two sides in the thin wall solidification process are the same by matching with the thickness sum of the ceramic support body on one side of the wax mold and the thickness sum of the shell on the other side of the wax mold, so that a single crystal high-temperature alloy thin-wall casting with uniform tissue is obtained, and the problems that in the prior art (namely the wax mold is pressed in the mold to cast a thin-wall sample), the temperature gradient difference caused by the thickness of slurry on two sides of the thin-wall casting is not considered in the coating process, the heat dissipation of one side is slow.
Furthermore, the inverted trapezoidal wax paper B which is attached to the top of the ceramic support body on the same side as the wax paper A is arranged, the short bottom edge of the wax paper B is controlled to be overlapped and connected with the top edge of the wax paper A, and an inverted trapezoidal casting cavity is formed in the position of the wax paper B after dewaxing, so that a drainage effect can be achieved during casting, and the problem that a wax mold is not full of filling can be solved.
Drawings
FIG. 1 is a front view of a casting system for a thin-walled casting of a flat plate according to example 1;
FIG. 2 is a metallographic photograph showing the dendritic structure of a thin-walled casting of a flat plate according to example 1;
FIG. 3 is a front view of a wax pattern of a thin-walled casting of a flat plate according to example 2;
FIG. 4 is a metallographic photograph of the dendritic structure of the casting of example 3.
Detailed Description
The invention provides a preparation method of a single crystal high temperature alloy thin-wall casting, which comprises the following steps:
attaching the wax paper A to the surface of a ceramic support body, and forming a wax pattern on the surface of the ceramic support body to obtain a support wax pattern combination; the bottom edge of the wax paper A is superposed with the bottom edge of the ceramic support body, and the shape and the size of the wax paper A are the same as those of a target single crystal superalloy thin-wall casting;
fixing a crystal selector and amplifier combination at the bottom of the supporting wax pattern combination to obtain an intermediate; the amplifier in the crystal selector and amplifier combination is connected with the bottom of the supporting wax pattern combination; the material of the crystal selector and amplifier combination is wax material;
assembling the intermediate body on a pouring gate disc, then carrying out slurry dipping and shell coating on the intermediate body to form a shell, and dewaxing to obtain a casting mold;
and casting the single-crystal high-temperature alloy melt into the casting mould to obtain the single-crystal high-temperature alloy thin-wall casting.
According to the invention, the wax paper A is attached to the surface of the ceramic support body, and the wax mould is formed on the surface of the ceramic support body, so that the support wax mould combination is obtained.
In the invention, the shape and the size of the wax paper A are the same as those of a target single crystal superalloy thin-wall casting; the invention preferably manufactures the wax paper A into the shape and the size of the target single crystal superalloy thin-wall casting by cutting. In the invention, the thickness of the wax paper A is the same as that of the target single crystal high-temperature alloy thin-wall casting, and the thickness of the wax paper A is preferably 0.3-1 mm, more preferably 0.5-1 mm. In the invention, the thin wall of the single crystal superalloy thin-wall casting can be equal in thickness or different in thickness. When the thin wall of the single crystal superalloy thin-wall casting is not of the same thickness, the thickness of the single crystal superalloy thin-wall casting is preferably gradually reduced from bottom to top along the solidification direction. The wax paper A is used as a mold of a target single crystal high-temperature alloy thin-wall casting, when thin-wall castings with different wall thicknesses or shapes need to be prepared, only the wax paper A with different thicknesses needs to be selected for cutting, and the thickness and the shape of the thin-wall casting can be conveniently adjusted.
In the present invention, the mass content of alumina in the ceramic support is preferably greater than 99%, and the thickness of the ceramic support is preferably 0.5 to 1mm, more preferably 0.6 to 0.9mm, and even more preferably 0.7 to 0.8 mm. In the invention, the ceramic support body with the alumina content and the thickness has high thermal conductivity so as to avoid uneven structure caused by large temperature difference between two sides of the wax mould during casting. In the invention, the shape of the ceramic support body is preferably determined according to the shape of the target single crystal superalloy thin-wall casting, and the ceramic support body corresponds to the shape of the target single crystal superalloy thin-wall casting, and can be a flat plate, an arc, a circular ring and the like. In the invention, the longitudinal dimension of the ceramic support body is preferably the same as that of the single-crystal high-temperature alloy thin-wall casting, and the transverse dimension of the ceramic support body is preferably 1-5 mm larger than that of the single-crystal high-temperature alloy thin-wall casting, so that the position of the wax paper A can be conveniently adjusted. The ceramic support body is used for supporting the wax paper A, and the wax paper A is attached to the surface of the ceramic support body, so that the shape of a thin-wall wax mould can be kept stable and not deformed in the processes of slurry coating and casting, and the problem that the wax mould is easy to deform is solved.
The invention has no special requirement on the attaching mode of the wax paper A, and specifically, the wax paper A can be directly attached to the surface of the ceramic support body by utilizing the viscosity of the wax paper, and can also be attached by using wax materials for assistance. In the invention, in the longitudinal direction, the bottom edge of the wax paper A is superposed with the bottom edge of the ceramic support body; in the transverse direction, the stencil paper a is preferably located at the center of the ceramic support.
The ceramic support body is characterized by further comprising wax paper B which is attached to the top of the ceramic support body on the same side as the wax paper A, the wax paper B is preferably in an inverted trapezoid shape, and the short bottom edge of the wax paper B is overlapped and connected with the top edge of the wax paper A. In the invention, the height of the wax paper B is preferably 10-15 mm, and more preferably 11-14 mm; the long bottom edge is preferably 1.25 to 2 times, and more preferably 1.5 to 1.8 times of the short bottom edge.
When the wax paper B is attached to the top of the ceramic support body, the longitudinal dimension of the ceramic support body is preferably the sum of the longitudinal dimension of the target single crystal superalloy thin-wall casting and the height of the wax paper B, and the transverse dimension of the ceramic support body is preferably 1-5 mm larger than the transverse dimension of the target single crystal superalloy thin-wall casting, so that the position of the wax paper A can be adjusted conveniently. Specifically, the short bottom edge of the wax paper B is overlapped and connected with the top edge of the wax paper A, and the long bottom edge of the wax paper B is overlapped with the top edge of the ceramic support body.
According to the invention, the inverted trapezoidal wax paper B which is attached to the top of the ceramic support body on the same side as the wax paper A is arranged, the short bottom edge of the wax paper B is controlled to be overlapped and connected with the top edge of the wax paper A, and an inverted trapezoidal casting cavity is formed at the position of the wax paper B after dewaxing, so that a drainage effect can be realized during casting, and the problem of insufficient filling of a wax pattern is avoided.
After the supporting wax pattern combination is obtained, fixing a crystal selector and an amplifier combination at the bottom of the supporting wax pattern combination to obtain an intermediate; and an amplifier in the crystal selector and amplifier combination is connected with the bottom of the supporting wax pattern combination. In the invention, the material of the crystal selector and amplifier combination is wax material; the crystal selector and amplifier combination is preferably a spiral crystal selector and triangular prism shaped amplifier combination. The invention has no special requirement on the combination mode of the crystal selector and the amplifier, and the combination mode well known in the field can be adopted. In the embodiment of the invention, the sharp corners on the same edge in the triangular prism-shaped amplifier are positioned at the center of the spiral crystal selector. The invention has no special requirement on the fixing mode of the crystal selector and amplifier combination, and the fixing mode known in the field, such as pasting, is adopted. The invention has no special requirement on the specific position of the amplifier and the bottom of the supporting wax pattern combination, and the amplifier and the bottom of the supporting wax pattern combination can be connected by selecting the position well known in the field. Specifically, when the amplifier is a triangular prism-shaped amplifier, the side surface of the triangular prism-shaped amplifier in a rectangular shape is contacted with the bottom of the supporting wax pattern combination, and the bottom of the supporting wax pattern combination is positioned in the center of the rectangular side surface; the length of the rectangular side face is preferably greater than or equal to the transverse dimension of the wax pattern to form a closed shell; the width of the rectangular side face is preferably larger than the thickness of the supporting wax mold combination so as to realize the support of the slurry coating shell on the ceramic supporting body and the wax mold. The invention is provided with the amplifier, when the amplifier is removed after dewaxing, a cavity can be formed at the bottom of the wax mould, on one hand, the cavity can play a role in seeding, and on the other hand, the buffer is arranged in the upward filling process of the molten metal, so that stable filling can be realized.
After the intermediate is obtained, the intermediate is assembled on a pouring gate disc, then slurry dipping and shell coating are carried out on the intermediate to form a shell, and the casting mold is obtained after dewaxing.
The present invention has no special requirement on the assembling mode, and the assembling mode known in the field can be adopted. The process of the invention for coating the shell with the slurry has no special requirements, and the process well known in the field can be adopted. In the process of coating the shell by dipping, a shell is formed around the ceramic support body and the wax mould as a whole and around the crystal selector and the amplifier combination. In the invention, when the shell is coated by the slurry, the wax mould is divided, one side of the wax mould is provided with the ceramic support body and the shell, the other side of the wax mould is provided with the shell, and the sum of the thicknesses of the ceramic support body and the shell at one side of the wax mould is preferably equal to the thickness of the shell at the other side of the wax mould, so that the temperature gradient of the shells at two sides of the wax mould during casting is reduced, and a uniform and fine tissue is obtained. In the invention, the shell thickness of the side of the wax mould without the ceramic support body is preferably 5-15 mm, and more preferably 5-10 mm; the invention has no special requirement on the thickness of the shell layer around the crystal selector and amplifier combination, and the shell layer is preferably the same as the shell layer on the side of the wax mould without the ceramic support.
In the invention, the dewaxing is preferably steam dewaxing, and the dewaxing temperature is preferably 120-150 ℃, more preferably 130-140 ℃; the time is preferably 20 to 60min, and more preferably 30 to 50 min. In the dewaxing process, the wax paper A, the crystal selector and the amplifier are combined and removed to obtain a casting mold. When the stencil B is contained, the stencil B is removed together with the stencil A at the time of dewaxing.
After a casting mold is obtained, the single crystal high temperature alloy melt is cast into the casting mold to obtain a single crystal high temperature alloy thin-wall casting.
The invention has no special requirements on the components of the single crystal superalloy melt, and the single crystal superalloy known in the field can be used. In the embodiment of the invention, the nickel-based single crystal alloy is specifically adopted, and the component is Ni-6Al-6Ta-2Cr-5 Mo.
Before casting, the invention preferably also comprises the step of heating the casting mould to 800 ℃ and preserving the temperature for 1-10 min.
In the invention, the casting temperature is preferably 1520-1560 ℃, more preferably 1530-1550 ℃; the drawing speed is preferably 1 to 5mm/min, more preferably 2 to 4 mm/min. The invention preferably uses a bottom-injection method for casting. The casting is preferably carried out in a vacuum induction single crystal furnace.
After the casting is finished, the invention preferably also comprises removing the shell on the surface of the casting, and cutting off the shell and the pouring gate disc at the periphery of the crystal selector and amplifier combination to obtain the single crystal superalloy thin-wall casting.
The method can be used for preparing the thin-wall casting with the thickness of 0.3-1 mm and the shape meeting the requirements, the dendritic crystals on the two sides of the casting are similar in size and uniform in structure, the problems of bending deformation, under-casting and the like are solved, and the wax mold manufacturing yield and the casting yield are improved.
The following will explain the preparation method of the thin-walled single-crystal superalloy casting provided by the present invention in detail with reference to the examples, but they should not be construed as limiting the scope of the present invention.
Example 1
As shown in fig. 1, a ceramic plate (as a ceramic support) of 50mm × 150mm × 1mm is used, wax paper a of 40mm × 140mm × 0.5mm in casting specification is cut and pasted on the ceramic plate, trapezoidal wax paper B of 10mm in height, 50mm in long bottom edge, 40mm in short bottom edge and 0.5mm in thickness is cut and pasted on the ceramic plate by being closely attached to the wax paper a, and the short bottom edge of the trapezoidal wax paper B is overlapped with the top edge of the wax paper a to form a wax pattern. And (3) a spiral crystal selector and an amplifier C are combined and stuck below the ceramic plate and the wax paper A to obtain orientation control, the ceramic plate and the wax paper A are combined on a pouring gate disc, slurry is applied to coat a shell, and the thickness sum (the sum is 6mm) of the ceramic support body and the shell on one side of the wax mould is controlled to be equal to the thickness of the shell on the other side of the wax mould. And (3) dewaxing by adopting steam at the dewaxing temperature of 130 ℃ for 30min to obtain a casting mould. Heating the casting mold to 800 ℃ for heat preservation for standby, placing the casting mold in a vacuum induction single crystal furnace for heat preservation for 10min during casting, then casting, wherein the cast melt is Ni-6Al-6Ta-2Cr-5Mo alloy melt, the casting temperature is 1540 ℃, the drawing speed is 3.5mm/min, directionally solidifying, removing a surface shell, and cutting off the shell and a pouring gate disc around the crystal selector and the amplifier combination to obtain the single crystal superalloy thin-wall casting with uniform structure.
The single crystal thin-wall casting with the thickness of 0.5mm and the same dendrite sizes at two sides is obtained by the method without the conditions of under-casting deformation and the like, and a specific dendrite structure diagram is shown in figure 2. As can be seen from FIG. 2, the cast product obtained in this example had a fine and uniform texture.
Example 2
As shown in fig. 3, a ceramic plate (as a ceramic support) of 50mm by 150mm by 1mm was used. The wax papers A1, A2 and A3 with the casting specification of 45mm x 1mm, 45mm x 0.8mm and 45mm x 0.6mm are respectively cut, the thickness of the wax papers is gradually reduced and tightly attached to the ceramic plate along the solidification direction from bottom to top, and the transition part between the wax papers is gradually changed and transited by adopting melting wax adhesive. A trapezoid wax paper B with the height of 15mm, the long bottom edge of 50mm, the short bottom edge of 45mm and the thickness of 0.6mm is cut and stuck on the ceramic plate by clinging to the wax paper A3, and the lower bottom edge is superposed with the top edge of the wax paper A3. And (3) sticking the spiral crystal selector and amplifier combination C below the ceramic plate, combining on a pouring gate disc, dipping slurry and coating a shell, and controlling the sum (the sum is 8mm) of the thicknesses of the ceramic support body and the shell on one side of the wax mould to be equal to the thickness of the shell on the other side of the wax mould. And (3) dewaxing by adopting steam at the dewaxing temperature of 140 ℃ for 40min to obtain the casting mould. Heating the casting mold to 800 ℃ for heat preservation for standby, placing the casting mold in a vacuum induction single crystal furnace for heat preservation for 10min during casting, then casting, wherein the cast melt is Ni-6Al-6Ta-2Cr-5Mo alloy melt, the casting temperature is 1550 ℃, the drawing speed is 4.5mm/min, casting in the vacuum induction single crystal furnace, directionally solidifying, removing a surface shell, and cutting off the shell and a pouring gate disc at the periphery of a crystal selector and an amplifier combination to obtain single crystal high temperature alloy thin-wall castings with uniform tissues and different thicknesses.
Example 3
A ceramic plate of 50mm 140mm 0.8mm gauge was used (as ceramic support). The wax paper A with the specification of casting parts of 40mm 125mm 0.8mm is cut and tightly attached to the ceramic plate, and the transition part between the wax papers is gradually changed and transited by adopting a melting wax adhesive. And cutting a trapezoidal wax paper B with the height of 15mm, the long bottom edge of 50mm, the short bottom edge of 40mm and the thickness of 0.8mm, sticking the trapezoidal wax paper B on the ceramic plate by clinging to the wax paper A, and enabling the short bottom edge of the trapezoidal wax paper B to coincide with the top edge of the wax paper A to form a wax mould. And (3) the spiral crystal selector and amplifier combination C is adhered below the ceramic plate and combined on the runner plate, and the shell is uniformly coated on two sides regardless of the thickness of the ceramic plate (namely the thickness of the shell is 8 mm). And (3) dewaxing by adopting steam at the dewaxing temperature of 130 ℃ for 30min to obtain a casting mould. Heating the casting mold to 800 ℃ for heat preservation for standby, placing the casting mold in a vacuum induction single crystal furnace for heat preservation for 10min during casting, then casting, wherein the cast melt is Ni-6Al-6Ta-2Cr-5Mo alloy melt, the casting temperature is 1540 ℃, the drawing speed is 3.5mm/min, casting in the vacuum induction single crystal furnace, directionally solidifying, removing a surface shell, and cutting off the shell and a pouring gate disc around the crystal selector and the amplifier combination to obtain a single crystal high temperature alloy thin-wall casting with the thickness of 0.8 mm.
A0.8 mm thick single crystal thin-walled casting can be obtained by the above method, but because the influence of the ceramic plate on the shell thickness is not considered, the dendritic structure is relatively coarse, and the specific dendritic structure is shown in FIG. 4.
According to the embodiment, the invention provides the preparation method of the single crystal high-temperature alloy thin-wall casting, the thin-wall casting with the thickness of 0.3-1 mm and the shape meeting the requirement can be prepared by adopting the method, the dendritic crystals on two sides of the casting are similar in size, the structure is uniform, the problems of bending deformation, under-casting and the like are avoided, and the wax mold manufacturing yield and the casting yield are improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The preparation method of the single crystal superalloy thin-wall casting is characterized by comprising the following steps:
attaching the wax paper A to the surface of a ceramic support body, and forming a wax pattern on the surface of the ceramic support body to obtain a support wax pattern combination; the bottom edge of the wax paper A is superposed with the bottom edge of the ceramic support body, and the shape and the size of the wax paper A are the same as those of a target single crystal superalloy thin-wall casting;
fixing a crystal selector and amplifier combination at the bottom of the supporting wax pattern combination to obtain an intermediate; the amplifier in the crystal selector and amplifier combination is connected with the bottom of the supporting wax pattern combination; the material of the crystal selector and amplifier combination is wax material;
assembling the intermediate body on a pouring gate disc, then carrying out slurry dipping and shell coating on the intermediate body to form a shell, and dewaxing to obtain a casting mold; when the shell is coated by the slurry, the wax mould is divided, one side of the wax mould is provided with a ceramic support body and a shell, the other side of the wax mould is provided with the shell, and the sum of the thicknesses of the ceramic support body and the shell at one side of the wax mould is equal to the thickness of the shell at the other side of the wax mould;
and casting the single-crystal high-temperature alloy melt into the casting mould to obtain the single-crystal high-temperature alloy thin-wall casting.
2. The method according to claim 1, wherein the mass content of alumina in the ceramic support is greater than 99%, and the thickness of the ceramic support is 0.5 to 1 mm.
3. The method according to claim 1, wherein the shell thickness of the side of the wax pattern without the ceramic support is 5-15 mm.
4. The preparation method according to claim 1, further comprising a stencil B attached to the top of the ceramic support body on the same side as the stencil A, wherein the stencil B has an inverted trapezoid shape, and a short bottom edge of the stencil B is overlapped and connected with a top edge of the stencil A.
5. The method according to claim 4, wherein the height of the stencil B is 10 to 15mm, and the long base is 1.25 to 2 times of the short base.
6. The method according to claim 4 or 5, wherein the ceramic support has a longitudinal dimension which is the sum of a longitudinal dimension of the target thin-walled single-crystal superalloy casting and a height of the stencil B, and a transverse dimension which is 1 to 5mm larger than a transverse dimension of the target thin-walled single-crystal superalloy casting.
7. The method according to claim 1, wherein the dewaxing is steam dewaxing, and the dewaxing temperature is 120 to 150 ℃ and the dewaxing time is 20 to 60 min.
8. The method according to claim 1, wherein the casting temperature is 1520-1560 ℃ and the drawing speed is 1-5 mm/min.
9. The preparation method according to claim 1, wherein the wall thickness of the single crystal superalloy thin-wall casting is 0.3-1 mm.
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| CN202010258519.5A CN111299511B (en) | 2020-04-03 | 2020-04-03 | Preparation method of single crystal high-temperature alloy thin-wall casting |
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| CN202010258519.5A CN111299511B (en) | 2020-04-03 | 2020-04-03 | Preparation method of single crystal high-temperature alloy thin-wall casting |
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| CN111299511B true CN111299511B (en) | 2021-02-09 |
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